Arm guard



FIG. 1 is a front perspective view of an arm guard showing the new design;

FIG. 2 is a front view;

FIG. 3 is a rear view;

FIG. 4 is a right view;

FIG. 5 is a left view;

FIG. 6 is a bottom view; and,

FIG. 7 is a top view.

The stippling in the drawings represents shading and not a surface pattern. 

CLAIM The ornamental design for an arm guard, as shown and described. 